Actually, you can come up with a testing plan that works best for you.
I am sorry to say that I am not a good example of testing after OTJ, as I continued testing for one week and now only test on occasion when I'm curious or think something may be going on.
Typically, testing once a day, then once a week, then once a month, could work well for an OTJ cat. And of course testing whenever you suspect something may be going on and at random times.